<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .container {
            position: relative;
            height: 300px;
        }

        .left {
            position: absolute;
            left: 0;

            width: 200px;

            background-color: beige;
        }

        .center {
            position: absolute;
            left: 200px;
            right: 300px;
            background-color: bisque;
        }

        .right {
            position: absolute;
            right: 0;

            width: 300px;

            background-color: cornflowerblue;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="left">left</div>
        <div class="center">center</div>
        <div class="right">right</div>
    </div>
</body>

</html>